Trunk port in VM? (KVM)

[bhouse-nexthop]

I was curious if there is any way to tag multiple vlans on a single interface going to a VM. I'd like to be able to use VLANs inside a VM for a specific lab purpose. There may be up to a couple hundred vlans, so interfaces aren't scalable. These would need to be admin-assigned vlans ... basically managed outside of cloudstack.

[weizhouapache]

As far as I know, vlan trunking is supported by libvirt only if openvswitch is used as backend, not linux bridge.

if you use openvswitch, it could be supported by cloudstack with some simple code changes (currently it is not)

[bhouse-nexthop]

Pretty sure it got added to libvirt 11 for linux bridges (https://libvirt.org/news.html#v11-0-0-2025-01-15), so I know I'd need to backport that. But ok, its not a concept cloudstack natively supports at this moment.

[weizhouapache]

Pretty sure it got added to libvirt 11 for linux bridges (https://libvirt.org/news.html#v11-0-0-2025-01-15), so I know I'd need to backport that. But ok, its not a concept cloudstack natively supports at this moment.

oh cool, good to know it.
although most os distributions use libvirt 10 or 9, it will be supported in next LTS os releases.

We discussed it before. Maybe we can move to a higher priority. cc @rohityadavcloud @alexmattioli

[alexandremattioli]

That's very interesting news @weizhouapache Definitely worth having a look again.

[weizhouapache]

@alexandremattioli @bhouse-nexthop

created an issue : #11491

cc @rohityadavcloud